fix: handle empty URL parts in edit_uri to prevent TypeError

[suraj-aleph]

Summary

Fixes a TypeError crash in edit_uri.py when the monorepo plugin processes root-level pages (e.g. index.md).

Problem

__get_page_dir_alias splits page.url by / and pops parts in a while True loop until it finds a matching alias. For root-level pages the URL is empty or has no directory component, so parts becomes an empty list — and path.join(*parts) raises:

TypeError: join() missing 1 required positional argument: 'a'

Full traceback:

File "mkdocs_monorepo_plugin/edit_uri.py", line 37, in __get_page_dir_alias
    alias = path.join(*parts)
TypeError: join() missing 1 required positional argument: 'a'

This affects any project using the monorepo plugin with root-level pages in the main docs/ directory alongside !included sub-projects.

Fix

Two changes in edit_uri.py:

1. __get_page_dir_alias: Replace the while True loop with while parts so it terminates safely. Use path.join(*parts) if parts else "" to handle the final iteration. Return None when no alias matches instead of looping into a crash.

2. build: When __get_page_dir_alias() returns None (page doesn't belong to any included sub-project), fall back to the page's default edit_url instead of proceeding to methods that would KeyError on a None alias.

Related

Fixes #131

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